DRAFT
2026-05-07 15:23:59
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.127....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Khaulsay (Cardiff), C. Cárdenas (UA), A. Reguitti (INAF), C. Gutiérrez (ICE-CSIC), T. Kravtsov (UTU), A. Dutta, A. Sankar.K, A. Aryan, Y.-H. Lee, M.-H. Lee, W-C. Lu，H-M. Chang,  P-Y. Wang, T.-W. Chen (NCU), F. Onori (INAF), J. Sollerman (Stockholm), G. Leloudas (DTU Space), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (UTU), T. Müller Bravo (Trinity), P. J. Pessi (Warsaw), O. Yaron (Weizmann), D. R. Young (QUB), J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), S. Srivastav, H. Stevance (Oxford), M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Astronomical Databases, Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes classifications of 2 Type Ia's and i Type Ia-Ca-rich. We encourage followup observations.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S), and the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Williams et al. 2024 2024RASTI...3..362W).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 4, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H), SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv, arXiv:2603.28741. doi:10.48550/arXiv.2603.28741) and DASH (Muthukrishna et al. 2019  2019ApJ...885...85M).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026kco [ZTF26aatdpkc] 11:50:42.960 -13:23:17.72 SN IIn 0.13 WISEA J115042.95-132317.3 Pre-peak Phase from light curve. Redshift from SNID-SAGE and NGSF. Probably an SLSN-IIn due to current M_r ~ -20.6 mag at the estimated redshift. 11:50:42.960 -13:23:17.72 SN IIn 0.13
TNS 2026kff [ATLAS26eod] 11:24:59.161 +02:39:45.99 SN Ia 0.063 2MASS J11245845+0239503 Post-peak Spectroscopic redshift from NED. Phase from light curve. 11:24:59.161 +02:39:45.99 SN Ia 0.063
TNS 2026ljy [ATLAS26fdy] 12:35:42.787 -04:05:03.10 SN Ia 0.06 WISEA J123542.07-040454.1 Pre-peak Redshift and phase from SNID-SAGE. 12:35:42.787 -04:05:03.13 SN Ia 0.06

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